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MinJeong Kim,SungGon Kim,HyoJeong Kim,HoChan Kim,JiHeh Park,KwangSeok Park,DukKi Lee,WonTan Byun,CheolMin Kim 대한신경정신의학회 2008 PSYCHIATRY INVESTIGATION Vol.5 No.3
Objective-The Penn Alcohol Craving Scale (PACS) is a stronger predictor of subsequent drinking and relapse of alcohol dependence that can be administered more quickly and easily than other craving scales. The goal of this study was to develop the Korean version of the Penn Alcohol Craving Scale (PACS-K). Methods-To examine the psychometric properties of the PACS-K, responses were chosen from 80 patients admitted to a treatment facility for alcohol dependence. Results-The PACS-K possesses good psychometric properties, as assessed by Cronbach’s α estimates (Cronbach’s α=0.91). The test-retest reliability of the PACS-K showed high correlation (p<0.01) when the retest interval was 1 day. When the validity of the PACS-K was investigated using correlation analysis with two other craving scales (the Obsessive Compulsive Drinking Scale (OCDS) and the Visual Analogue Scale (VAS), high correlations were obtained between total PACS scores and total OCDS scores, and between total PACS scores and VAS scores (p<0.01, respectively). Conclusion-The PACS-K is a reliable and valid measure of alcohol cravings, and it could be useful for predicting which individuals are at risk for subsequent relapse.
Importance sampling with splitting for portfolio credit risk
Kim, Jinyoung,Kim, Sunggon The Korean Statistical Society 2020 Communications for statistical applications and me Vol.27 No.3
We consider a credit portfolio with highly skewed exposures. In the portfolio, small number of obligors have very high exposures compared to the others. For the Bernoulli mixture model with highly skewed exposures, we propose a new importance sampling scheme to estimate the tail loss probability over a threshold and the corresponding expected shortfall. We stratify the sample space of the default events into two subsets. One consists of the events that the obligors with heavy exposures default simultaneously. We expect that typical tail loss events belong to the set. In our proposed scheme, the tail loss probability and the expected shortfall corresponding to this type of events are estimated by a conditional Monte Carlo, which results in variance reduction. We analyze the properties of the proposed scheme mathematically. In numerical study, the performance of the proposed scheme is compared with an existing importance sampling method.
A Level Crossing Approach to the Analysis of Finite Dam
Kim, Sunggon,Lee, Eui-Yong The Korean Statistical Society 2002 Journal of the Korean Statistical Society Vol.31 No.3
We consider a finite dam with general inputs and adopt the level crossing approach to obtain explicit formulas of the expected wet period, the expected loss of water due to overflows in a wet period, and the long-run proportion of loss in inputed water.
Kim, Sunggon The Korean Statistical Society 2018 Communications for statistical applications and me Vol.25 No.4
$P^M_{\lambda}$-service policy is a workload dependent hysteretic policy. The policy has two service states comprised of the ordinary stage and the fast stage. An ordinary service stage is initiated by the arrival of a customer in an idle state. When the workload of the server surpasses threshold ${\lambda}$, the ordinary service stage changes to the fast service state, and it continues until the system is empty. These service stages alternate in this manner. When the cost of changing service stages is high, the hysteretic policy is more efficient than the threshold policy, where a service stage changes immediately into the other service stage at either case of the workload's surpassing or crossing down a threshold. $P^M_{\lambda}$-service policy is a modification of $P^M_{\lambda}$-policy proposed to control finite dams, and also an extension of the well-known D-policy. The distributions of the stationary workload of $P^M_{\lambda}$-service policy and its variants are studied well. However, there is no known result on the sojourn time distribution. We prove that there is a relation between the sojourn time of a customer and the first up-crossing time of the workload process over the threshold ${\lambda}$ after the arrival of the customer. Using the relation and the duality of M/G/1 and G/M/1 queues, we obtain conditional sojourn time distributions in M/G/1 and G/M/1 queues under the policy.
Bandwidth allocation for fluid input generalized processor sharing servers
Sunggon Kim,Ju Lee,Dan Sung IEEE 2010 IEEE TRANSACTIONS ON COMMUNICATIONS Vol.58 No.5
<P>Generalized processor sharing (GPS) service policy is a scheduling algorithm to allocate the bandwidth of a queueing system with multi-class input traffic. Simulating the GPS system in realistic traffic environments requires a large amount of time. Thus, fluid simulation is useful because it requires much less time. We analyze the bandwidth allocation for fluid simulation in GPS servers, in which the traffic into the server is treated as fluid. Three properties which characterize GPS servers with fluid input are discussed. We show that there exists a unique bandwidth allocation with the properties. It is shown that our previously proposed algorithm gives the unique bandwidth allocation and it is equivalent to the well-known Newton-Rapson method. In numerical study, the performance of finding the unique bandwidth allocation based on other known root finding methods is compared with that of our previous algorithm. We also investigate the impact of the length of the unit time on the accuracy of the performance measures.</P>
미러리스 자동차내 CMS 디스플레이의 적합한 위치에 관한 연구
김성곤(Sunggon Kim),박예은(Yeeun Park),강소이(Soyi Kang),김헌(Huhn Kim) 한국HCI학회 2018 한국HCI학회 학술대회 Vol.2018 No.1
공기 저항을 줄여 연비를 높일 수 있는 미러리스 자동차가 최근 등장하고 있다. 미러리스(Mirrorless) 자동차는 기존 사이드 미러를 대신해 그 위치에 영상촬영 카메라를 부착한 자동차이다. 이 카메라로 촬영된 외부 영상은 차내에 있는 CMS(Camera Monitoring System) 디스플레이로 운전자에게 보여진다. CMS 디스플레이는 사이드 미러의 역할을 하므로 운전자의 안전과 직결된다. 따라서 운전자가 편하고 안전하게 정보를 획득할 수 있는 위치에 CMS 디스플레이를 배치해야 한다. 본 연구에서는 CMS의 배치 가능한 위치인 기존 사이드미러 근처, 룸미러 내부, 대시보드 위에 대해 가장 적합한 위치를 평가하는 운전 시뮬레이션 실험을 수행하였다. 실험결과, CMS 디스플레이 속 자극의 인식 정확도에서는 룸미러 위치가 가장 좋았으나 주관적 만족도에 있어서는 대시보드 위치가 가장 좋았다. 이러한 결과는 향후 자동차 제조사가 미러리스 자동차 제작시 CMS의 위치 결정에 활용할 수 있다.